Speaker
Description
In heavy-ion collisions, the production mechanism of light (anti-)nuclei can be explained by either the thermal model or the coalescence model. By studying the yields and yield ratios of the light (anti-)nuclei, we can gain a better understanding of their production mechanisms and the properties of the expanding system during freeze-out. Additionally, it has been proposed that the enhancement of light nuclei compound ratios, e.g. $N_{t}N_{p}/N_{d}^{2}$ and $N_{^4He}N_{p}/N_{^3He}N_{d}$, with respect to the coalescence baseline could serve as a probe of critical phenomena in the QCD phase diagram.
In the first phase of the Beam Energy Scan (BES-I) program at RHIC, an enhancement relative to the coalescence baseline of the light nuclei yield ratio ($N_{t}N_{p}/N_{d}^{2}$) was observed in the most central Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 and 27 GeV, with a combined significance of 4.1$\sigma$. The precision of the new measurements will be significantly improved by the large data sets ($\sim10\times$ BES-I) obtained by the STAR BES-II with upgraded detector capabilities.
In this talk, we will present the centrality and energy dependence of transverse momentum ($p_T$) spectra of $p$, $\bar{p}$, $d$, $\bar{d}$, and $^{3}He$ in Au+Au collisions at BES-II energies of $\sqrt{s_{NN}}$ = 7.7 - 27 GeV. We will also report on the centrality and energy dependence of integrated particle yields ($dN/dy$) and mean $p_T$ ($\langle p_T \rangle$) of light nuclei. Furthermore, we will discuss the centrality and $p_T$ dependence of the coalescence parameters ($B_{2}(d)$ and $B_{3}(^3He)$). The physics implications of these results will be discussed.
Details
Name - Sibaram Behera
Title - Doctoral student
Institution name - Indian Institute of Science Education and Research (IISER), Tirupati
Country - India
Webpage of institution - https://www.iisertirupati.ac.in/
| Internet talk | Yes |
|---|---|
| Is this an abstract from experimental collaboration? | Yes |
| Name of experiment and experimental site | STAR Experiment, Brookhaven National Laboratory, USA |
| Is the speaker for that presentation defined? | Yes |
